Concordia is the Latin word for "harmony," literally "with (one) heart." It may refer to:
- Concordia (mythology), the Roman goddess of harmony
- Concordia (official title: Book of Concord), compilation of Lutheran doctrinal statements published in 1580
- Costa Concordia, the cruise ship lying capsized off the coast of Italy
- Concordia (genus), a genus of the extinct reptile family Captorhinidae
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